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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03274093c4fb96107b2388dca919b49e123fe8eaf47577da8aa28bb6a4ba019f' 
  AND token = '239ODxnnFolmqj63K3J5YA0oY9H8U2sDZt5UuNIXie0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}